1 /* 2 * Event char devices, giving access to raw input device events. 3 * 4 * Copyright (c) 1999-2002 Vojtech Pavlik 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 as published by 8 * the Free Software Foundation. 9 */ 10 11 #define EVDEV_MINOR_BASE 64 12 #define EVDEV_MINORS 32 13 #define EVDEV_BUFFER_SIZE 64 14 15 #include <linux/poll.h> 16 #include <linux/slab.h> 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/input.h> 20 #include <linux/major.h> 21 #include <linux/smp_lock.h> 22 #include <linux/device.h> 23 #include <linux/devfs_fs_kernel.h> 24 #include <linux/compat.h> 25 26 struct evdev { 27 int exist; 28 int open; 29 int minor; 30 char name[16]; 31 struct input_handle handle; 32 wait_queue_head_t wait; 33 struct evdev_list *grab; 34 struct list_head list; 35 }; 36 37 struct evdev_list { 38 struct input_event buffer[EVDEV_BUFFER_SIZE]; 39 int head; 40 int tail; 41 struct fasync_struct *fasync; 42 struct evdev *evdev; 43 struct list_head node; 44 }; 45 46 static struct evdev *evdev_table[EVDEV_MINORS]; 47 48 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) 49 { 50 struct evdev *evdev = handle->private; 51 struct evdev_list *list; 52 53 if (evdev->grab) { 54 list = evdev->grab; 55 56 do_gettimeofday(&list->buffer[list->head].time); 57 list->buffer[list->head].type = type; 58 list->buffer[list->head].code = code; 59 list->buffer[list->head].value = value; 60 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); 61 62 kill_fasync(&list->fasync, SIGIO, POLL_IN); 63 } else 64 list_for_each_entry(list, &evdev->list, node) { 65 66 do_gettimeofday(&list->buffer[list->head].time); 67 list->buffer[list->head].type = type; 68 list->buffer[list->head].code = code; 69 list->buffer[list->head].value = value; 70 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1); 71 72 kill_fasync(&list->fasync, SIGIO, POLL_IN); 73 } 74 75 wake_up_interruptible(&evdev->wait); 76 } 77 78 static int evdev_fasync(int fd, struct file *file, int on) 79 { 80 int retval; 81 struct evdev_list *list = file->private_data; 82 retval = fasync_helper(fd, file, on, &list->fasync); 83 return retval < 0 ? retval : 0; 84 } 85 86 static int evdev_flush(struct file * file) 87 { 88 struct evdev_list *list = file->private_data; 89 if (!list->evdev->exist) return -ENODEV; 90 return input_flush_device(&list->evdev->handle, file); 91 } 92 93 static void evdev_free(struct evdev *evdev) 94 { 95 evdev_table[evdev->minor] = NULL; 96 kfree(evdev); 97 } 98 99 static int evdev_release(struct inode * inode, struct file * file) 100 { 101 struct evdev_list *list = file->private_data; 102 103 if (list->evdev->grab == list) { 104 input_release_device(&list->evdev->handle); 105 list->evdev->grab = NULL; 106 } 107 108 evdev_fasync(-1, file, 0); 109 list_del(&list->node); 110 111 if (!--list->evdev->open) { 112 if (list->evdev->exist) 113 input_close_device(&list->evdev->handle); 114 else 115 evdev_free(list->evdev); 116 } 117 118 kfree(list); 119 return 0; 120 } 121 122 static int evdev_open(struct inode * inode, struct file * file) 123 { 124 struct evdev_list *list; 125 int i = iminor(inode) - EVDEV_MINOR_BASE; 126 int accept_err; 127 128 if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist) 129 return -ENODEV; 130 131 if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file))) 132 return accept_err; 133 134 if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL))) 135 return -ENOMEM; 136 memset(list, 0, sizeof(struct evdev_list)); 137 138 list->evdev = evdev_table[i]; 139 list_add_tail(&list->node, &evdev_table[i]->list); 140 file->private_data = list; 141 142 if (!list->evdev->open++) 143 if (list->evdev->exist) 144 input_open_device(&list->evdev->handle); 145 146 return 0; 147 } 148 149 #ifdef CONFIG_COMPAT 150 struct input_event_compat { 151 struct compat_timeval time; 152 __u16 type; 153 __u16 code; 154 __s32 value; 155 }; 156 157 #ifdef CONFIG_X86_64 158 # define COMPAT_TEST test_thread_flag(TIF_IA32) 159 #elif defined(CONFIG_IA64) 160 # define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current)) 161 #elif defined(CONFIG_ARCH_S390) 162 # define COMPAT_TEST test_thread_flag(TIF_31BIT) 163 #elif defined(CONFIG_MIPS) 164 # define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR) 165 #else 166 # define COMPAT_TEST test_thread_flag(TIF_32BIT) 167 #endif 168 169 static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 170 { 171 struct evdev_list *list = file->private_data; 172 struct input_event_compat event; 173 int retval = 0; 174 175 while (retval < count) { 176 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat))) 177 return -EFAULT; 178 input_event(list->evdev->handle.dev, event.type, event.code, event.value); 179 retval += sizeof(struct input_event_compat); 180 } 181 182 return retval; 183 } 184 #endif 185 186 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 187 { 188 struct evdev_list *list = file->private_data; 189 struct input_event event; 190 int retval = 0; 191 192 if (!list->evdev->exist) return -ENODEV; 193 194 #ifdef CONFIG_COMPAT 195 if (COMPAT_TEST) 196 return evdev_write_compat(file, buffer, count, ppos); 197 #endif 198 199 while (retval < count) { 200 201 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event))) 202 return -EFAULT; 203 input_event(list->evdev->handle.dev, event.type, event.code, event.value); 204 retval += sizeof(struct input_event); 205 } 206 207 return retval; 208 } 209 210 #ifdef CONFIG_COMPAT 211 static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 212 { 213 struct evdev_list *list = file->private_data; 214 int retval; 215 216 if (count < sizeof(struct input_event_compat)) 217 return -EINVAL; 218 219 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) 220 return -EAGAIN; 221 222 retval = wait_event_interruptible(list->evdev->wait, 223 list->head != list->tail || (!list->evdev->exist)); 224 225 if (retval) 226 return retval; 227 228 if (!list->evdev->exist) 229 return -ENODEV; 230 231 while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) { 232 struct input_event *event = (struct input_event *) list->buffer + list->tail; 233 struct input_event_compat event_compat; 234 event_compat.time.tv_sec = event->time.tv_sec; 235 event_compat.time.tv_usec = event->time.tv_usec; 236 event_compat.type = event->type; 237 event_compat.code = event->code; 238 event_compat.value = event->value; 239 240 if (copy_to_user(buffer + retval, &event_compat, 241 sizeof(struct input_event_compat))) return -EFAULT; 242 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); 243 retval += sizeof(struct input_event_compat); 244 } 245 246 return retval; 247 } 248 #endif 249 250 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 251 { 252 struct evdev_list *list = file->private_data; 253 int retval; 254 255 #ifdef CONFIG_COMPAT 256 if (COMPAT_TEST) 257 return evdev_read_compat(file, buffer, count, ppos); 258 #endif 259 260 if (count < sizeof(struct input_event)) 261 return -EINVAL; 262 263 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) 264 return -EAGAIN; 265 266 retval = wait_event_interruptible(list->evdev->wait, 267 list->head != list->tail || (!list->evdev->exist)); 268 269 if (retval) 270 return retval; 271 272 if (!list->evdev->exist) 273 return -ENODEV; 274 275 while (list->head != list->tail && retval + sizeof(struct input_event) <= count) { 276 if (copy_to_user(buffer + retval, list->buffer + list->tail, 277 sizeof(struct input_event))) return -EFAULT; 278 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); 279 retval += sizeof(struct input_event); 280 } 281 282 return retval; 283 } 284 285 /* No kernel lock - fine */ 286 static unsigned int evdev_poll(struct file *file, poll_table *wait) 287 { 288 struct evdev_list *list = file->private_data; 289 poll_wait(file, &list->evdev->wait, wait); 290 return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) | 291 (list->evdev->exist ? 0 : (POLLHUP | POLLERR)); 292 } 293 294 static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 295 { 296 struct evdev_list *list = file->private_data; 297 struct evdev *evdev = list->evdev; 298 struct input_dev *dev = evdev->handle.dev; 299 struct input_absinfo abs; 300 void __user *p = (void __user *)arg; 301 int __user *ip = (int __user *)arg; 302 int i, t, u, v; 303 304 if (!evdev->exist) return -ENODEV; 305 306 switch (cmd) { 307 308 case EVIOCGVERSION: 309 return put_user(EV_VERSION, ip); 310 311 case EVIOCGID: 312 return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0; 313 314 case EVIOCGKEYCODE: 315 if (get_user(t, ip)) return -EFAULT; 316 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; 317 if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT; 318 return 0; 319 320 case EVIOCSKEYCODE: 321 if (get_user(t, ip)) return -EFAULT; 322 if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) return -EINVAL; 323 if (get_user(v, ip + 1)) return -EFAULT; 324 if (v < 0 || v > KEY_MAX) return -EINVAL; 325 if (v >> (dev->keycodesize * 8)) return -EINVAL; 326 u = SET_INPUT_KEYCODE(dev, t, v); 327 clear_bit(u, dev->keybit); 328 set_bit(v, dev->keybit); 329 for (i = 0; i < dev->keycodemax; i++) 330 if (INPUT_KEYCODE(dev,i) == u) 331 set_bit(u, dev->keybit); 332 return 0; 333 334 case EVIOCSFF: 335 if (dev->upload_effect) { 336 struct ff_effect effect; 337 int err; 338 339 if (copy_from_user(&effect, p, sizeof(effect))) 340 return -EFAULT; 341 err = dev->upload_effect(dev, &effect); 342 if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id))) 343 return -EFAULT; 344 return err; 345 } 346 else return -ENOSYS; 347 348 case EVIOCRMFF: 349 if (dev->erase_effect) { 350 return dev->erase_effect(dev, (int)arg); 351 } 352 else return -ENOSYS; 353 354 case EVIOCGEFFECTS: 355 if (put_user(dev->ff_effects_max, ip)) 356 return -EFAULT; 357 return 0; 358 359 case EVIOCGRAB: 360 if (arg) { 361 if (evdev->grab) 362 return -EBUSY; 363 if (input_grab_device(&evdev->handle)) 364 return -EBUSY; 365 evdev->grab = list; 366 return 0; 367 } else { 368 if (evdev->grab != list) 369 return -EINVAL; 370 input_release_device(&evdev->handle); 371 evdev->grab = NULL; 372 return 0; 373 } 374 375 default: 376 377 if (_IOC_TYPE(cmd) != 'E') 378 return -EINVAL; 379 380 if (_IOC_DIR(cmd) == _IOC_READ) { 381 382 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { 383 384 long *bits; 385 int len; 386 387 switch (_IOC_NR(cmd) & EV_MAX) { 388 case 0: bits = dev->evbit; len = EV_MAX; break; 389 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; 390 case EV_REL: bits = dev->relbit; len = REL_MAX; break; 391 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; 392 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; 393 case EV_LED: bits = dev->ledbit; len = LED_MAX; break; 394 case EV_SND: bits = dev->sndbit; len = SND_MAX; break; 395 case EV_FF: bits = dev->ffbit; len = FF_MAX; break; 396 case EV_SW: bits = dev->swbit; len = SW_MAX; break; 397 default: return -EINVAL; 398 } 399 len = NBITS(len) * sizeof(long); 400 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 401 return copy_to_user(p, bits, len) ? -EFAULT : len; 402 } 403 404 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) { 405 int len; 406 len = NBITS(KEY_MAX) * sizeof(long); 407 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 408 return copy_to_user(p, dev->key, len) ? -EFAULT : len; 409 } 410 411 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) { 412 int len; 413 len = NBITS(LED_MAX) * sizeof(long); 414 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 415 return copy_to_user(p, dev->led, len) ? -EFAULT : len; 416 } 417 418 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) { 419 int len; 420 len = NBITS(SND_MAX) * sizeof(long); 421 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 422 return copy_to_user(p, dev->snd, len) ? -EFAULT : len; 423 } 424 425 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) { 426 int len; 427 len = NBITS(SW_MAX) * sizeof(long); 428 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 429 return copy_to_user(p, dev->sw, len) ? -EFAULT : len; 430 } 431 432 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { 433 int len; 434 if (!dev->name) return -ENOENT; 435 len = strlen(dev->name) + 1; 436 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 437 return copy_to_user(p, dev->name, len) ? -EFAULT : len; 438 } 439 440 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { 441 int len; 442 if (!dev->phys) return -ENOENT; 443 len = strlen(dev->phys) + 1; 444 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 445 return copy_to_user(p, dev->phys, len) ? -EFAULT : len; 446 } 447 448 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { 449 int len; 450 if (!dev->uniq) return -ENOENT; 451 len = strlen(dev->uniq) + 1; 452 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 453 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; 454 } 455 456 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { 457 458 int t = _IOC_NR(cmd) & ABS_MAX; 459 460 abs.value = dev->abs[t]; 461 abs.minimum = dev->absmin[t]; 462 abs.maximum = dev->absmax[t]; 463 abs.fuzz = dev->absfuzz[t]; 464 abs.flat = dev->absflat[t]; 465 466 if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) 467 return -EFAULT; 468 469 return 0; 470 } 471 472 } 473 474 if (_IOC_DIR(cmd) == _IOC_WRITE) { 475 476 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { 477 478 int t = _IOC_NR(cmd) & ABS_MAX; 479 480 if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) 481 return -EFAULT; 482 483 dev->abs[t] = abs.value; 484 dev->absmin[t] = abs.minimum; 485 dev->absmax[t] = abs.maximum; 486 dev->absfuzz[t] = abs.fuzz; 487 dev->absflat[t] = abs.flat; 488 489 return 0; 490 } 491 } 492 } 493 return -EINVAL; 494 } 495 496 #ifdef CONFIG_COMPAT 497 498 #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) 499 #define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1) 500 #define OFF_COMPAT(x) ((x)%BITS_PER_LONG_COMPAT) 501 #define BIT_COMPAT(x) (1UL<<OFF_COMPAT(x)) 502 #define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT) 503 #define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1) 504 505 #ifdef __BIG_ENDIAN 506 #define bit_to_user(bit, max) \ 507 do { \ 508 int i; \ 509 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \ 510 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \ 511 for (i = 0; i < len / sizeof(compat_long_t); i++) \ 512 if (copy_to_user((compat_long_t*) p + i, \ 513 (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \ 514 sizeof(compat_long_t))) \ 515 return -EFAULT; \ 516 return len; \ 517 } while (0) 518 #else 519 #define bit_to_user(bit, max) \ 520 do { \ 521 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \ 522 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \ 523 return copy_to_user(p, (bit), len) ? -EFAULT : len; \ 524 } while (0) 525 #endif 526 527 static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 528 { 529 struct evdev_list *list = file->private_data; 530 struct evdev *evdev = list->evdev; 531 struct input_dev *dev = evdev->handle.dev; 532 struct input_absinfo abs; 533 void __user *p = compat_ptr(arg); 534 535 if (!evdev->exist) return -ENODEV; 536 537 switch (cmd) { 538 539 case EVIOCGVERSION: 540 case EVIOCGID: 541 case EVIOCGKEYCODE: 542 case EVIOCSKEYCODE: 543 case EVIOCSFF: 544 case EVIOCRMFF: 545 case EVIOCGEFFECTS: 546 case EVIOCGRAB: 547 return evdev_ioctl(file, cmd, (unsigned long) p); 548 549 default: 550 551 if (_IOC_TYPE(cmd) != 'E') 552 return -EINVAL; 553 554 if (_IOC_DIR(cmd) == _IOC_READ) { 555 556 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { 557 long *bits; 558 int max; 559 560 switch (_IOC_NR(cmd) & EV_MAX) { 561 case 0: bits = dev->evbit; max = EV_MAX; break; 562 case EV_KEY: bits = dev->keybit; max = KEY_MAX; break; 563 case EV_REL: bits = dev->relbit; max = REL_MAX; break; 564 case EV_ABS: bits = dev->absbit; max = ABS_MAX; break; 565 case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break; 566 case EV_LED: bits = dev->ledbit; max = LED_MAX; break; 567 case EV_SND: bits = dev->sndbit; max = SND_MAX; break; 568 case EV_FF: bits = dev->ffbit; max = FF_MAX; break; 569 default: return -EINVAL; 570 } 571 bit_to_user(bits, max); 572 } 573 574 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) 575 bit_to_user(dev->key, KEY_MAX); 576 577 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) 578 bit_to_user(dev->led, LED_MAX); 579 580 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) 581 bit_to_user(dev->snd, SND_MAX); 582 583 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { 584 int len; 585 if (!dev->name) return -ENOENT; 586 len = strlen(dev->name) + 1; 587 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 588 return copy_to_user(p, dev->name, len) ? -EFAULT : len; 589 } 590 591 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { 592 int len; 593 if (!dev->phys) return -ENOENT; 594 len = strlen(dev->phys) + 1; 595 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 596 return copy_to_user(p, dev->phys, len) ? -EFAULT : len; 597 } 598 599 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { 600 int len; 601 if (!dev->uniq) return -ENOENT; 602 len = strlen(dev->uniq) + 1; 603 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 604 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; 605 } 606 607 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { 608 609 int t = _IOC_NR(cmd) & ABS_MAX; 610 611 abs.value = dev->abs[t]; 612 abs.minimum = dev->absmin[t]; 613 abs.maximum = dev->absmax[t]; 614 abs.fuzz = dev->absfuzz[t]; 615 abs.flat = dev->absflat[t]; 616 617 if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) 618 return -EFAULT; 619 620 return 0; 621 } 622 } 623 624 if (_IOC_DIR(cmd) == _IOC_WRITE) { 625 626 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { 627 628 int t = _IOC_NR(cmd) & ABS_MAX; 629 630 if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) 631 return -EFAULT; 632 633 dev->abs[t] = abs.value; 634 dev->absmin[t] = abs.minimum; 635 dev->absmax[t] = abs.maximum; 636 dev->absfuzz[t] = abs.fuzz; 637 dev->absflat[t] = abs.flat; 638 639 return 0; 640 } 641 } 642 } 643 return -EINVAL; 644 } 645 #endif 646 647 static struct file_operations evdev_fops = { 648 .owner = THIS_MODULE, 649 .read = evdev_read, 650 .write = evdev_write, 651 .poll = evdev_poll, 652 .open = evdev_open, 653 .release = evdev_release, 654 .unlocked_ioctl = evdev_ioctl, 655 #ifdef CONFIG_COMPAT 656 .compat_ioctl = evdev_ioctl_compat, 657 #endif 658 .fasync = evdev_fasync, 659 .flush = evdev_flush 660 }; 661 662 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) 663 { 664 struct evdev *evdev; 665 int minor; 666 667 for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++); 668 if (minor == EVDEV_MINORS) { 669 printk(KERN_ERR "evdev: no more free evdev devices\n"); 670 return NULL; 671 } 672 673 if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL))) 674 return NULL; 675 memset(evdev, 0, sizeof(struct evdev)); 676 677 INIT_LIST_HEAD(&evdev->list); 678 init_waitqueue_head(&evdev->wait); 679 680 evdev->exist = 1; 681 evdev->minor = minor; 682 evdev->handle.dev = dev; 683 evdev->handle.name = evdev->name; 684 evdev->handle.handler = handler; 685 evdev->handle.private = evdev; 686 sprintf(evdev->name, "event%d", minor); 687 688 evdev_table[minor] = evdev; 689 690 devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), 691 S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor); 692 class_device_create(input_class, 693 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), 694 dev->dev, "event%d", minor); 695 696 return &evdev->handle; 697 } 698 699 static void evdev_disconnect(struct input_handle *handle) 700 { 701 struct evdev *evdev = handle->private; 702 struct evdev_list *list; 703 704 class_device_destroy(input_class, 705 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor)); 706 devfs_remove("input/event%d", evdev->minor); 707 evdev->exist = 0; 708 709 if (evdev->open) { 710 input_close_device(handle); 711 wake_up_interruptible(&evdev->wait); 712 list_for_each_entry(list, &evdev->list, node) 713 kill_fasync(&list->fasync, SIGIO, POLL_HUP); 714 } else 715 evdev_free(evdev); 716 } 717 718 static struct input_device_id evdev_ids[] = { 719 { .driver_info = 1 }, /* Matches all devices */ 720 { }, /* Terminating zero entry */ 721 }; 722 723 MODULE_DEVICE_TABLE(input, evdev_ids); 724 725 static struct input_handler evdev_handler = { 726 .event = evdev_event, 727 .connect = evdev_connect, 728 .disconnect = evdev_disconnect, 729 .fops = &evdev_fops, 730 .minor = EVDEV_MINOR_BASE, 731 .name = "evdev", 732 .id_table = evdev_ids, 733 }; 734 735 static int __init evdev_init(void) 736 { 737 input_register_handler(&evdev_handler); 738 return 0; 739 } 740 741 static void __exit evdev_exit(void) 742 { 743 input_unregister_handler(&evdev_handler); 744 } 745 746 module_init(evdev_init); 747 module_exit(evdev_exit); 748 749 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 750 MODULE_DESCRIPTION("Input driver event char devices"); 751 MODULE_LICENSE("GPL"); 752